Cornerstone Theatre Arts in Goshen, New York. The production is sponsored by the Goshen Library and Historical Society, and is being presented at the Goshen Music Hall. The runs continues until Sunday, September 24. You can read a review here.
"Tesla's Letters" was first produced in 1999 at Ensemble Studio Theatre in New York City, and published by Samuel French. The play has had many regional theatre runs over the years, including one at Eastern Kentucky University two years ago.